Add Multidimensinal array to an array list using Java

问题

I am having a method(function) that is supposed to add a (8*6)Array to an Array list. Function is called several times.

int [][] KeySelection = new int [8][7];

  for(int i=0;i<KeySelection.length;i++){
  for(int j=0;j<KeySelection[0].length;j++){
      KeySelection[i][j] = (int) (Math.random () * 2);

     }
  }

Each time this function is called a totally new KeySelection Array is done. What i need now is to declare an array list so that it could store all the KeySelection Arrays in that list.

So that when i need the first KeySelection Table i could find it in the first index of the Array list. Could somebody Help

回答1:

Create an ArrayList of type int[][]: -

List<int[][]> list = new ArrayList<int[][]>();

And then, add your array to this list after creation: -

list.add(keySelection);

NOTE: - Variable name should start with lowercase letters.

回答2:

Since arrays in Java are special type of objects, you can use an ArrayList of objects to hold your arrays. Declare your list like that and populate it via for loop etc.

ArrayList<int[][]> list = new ArrayList<int[][]>();

来源：https://stackoverflow.com/questions/13430448/add-multidimensinal-array-to-an-array-list-using-java